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/**
Record of all registered hooks.
For internal use only.
*/
MG._hooks = {};
/**
Add a hook callthrough to the stack.
Hooks are executed in the order that they were registered.
*/
MG.add_hook = function(name, func, context) {
var hooks;
if (!MG._hooks[name]) {
MG._hooks[name] = [];
}
hooks = MG._hooks[name];
var already_registered =
hooks.filter(function(hook) {
return hook.func === func;
})
.length > 0;
if (already_registered) {
throw 'That function is already registered.';
}
hooks.push({
func: func,
context: context
});
};
/**
Execute registered hooks.
Optional arguments
*/
MG.call_hook = function(name) {
var hooks = MG._hooks[name],
result = [].slice.apply(arguments, [1]),
processed;
if (hooks) {
hooks.forEach(function(hook) {
if (hook.func) {
var params = processed || result;
if (params && params.constructor !== Array) {
params = [params];
}
params = [].concat.apply([], params);
processed = hook.func.apply(hook.context, params);
}
});
}
return processed || result;
};
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